doc: clarify --zero-terminated option

* src/join.c (usage): Reword to avoid implication that
the NUL byte is only generated as the output delimeter.
* src/sort.c (usage): Likewise.
* src/shuf.c (usage): Likewise. Also since we're changing the
translation string take the opportunity to separate out
the description to a separate string to reduce translation overhead.
* src/uniq.c (usage): Likewise.
* src/stty.c (usage): s/null/NUL/ for consistency.
* src/basename.c (usage): Reword for accuracy/consistency.
* src/dirname.c (usage): Likewise.
* src/du.c (usage): Likewise.
* src/env.c (usage): Likewise.
* src/printenv.c (usage): Likewise.
* src/readlink.c (usage): Likewise.
* src/realpath.c (usage): Likewise.
* doc/coreutils.texi: Consolidate/share the descriptions of
--null, --zero and --zero-terminated.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/env.c b/src/env.c
index 6a5c246a5..2b37d986e 100644
--- a/src/env.c
+++ b/src/env.c
@@ -60,7 +60,7 @@ Set each NAME to VALUE in the environment and run COMMAND.\n\
 
       fputs (_("\
   -i, --ignore-environment  start with an empty environment\n\
-  -0, --null           end each output line with 0 byte rather than newline\n\
+  -0, --null           end each output line with NUL, not newline\n\
   -u, --unset=NAME     remove variable from the environment\n\
 "), stdout);
       fputs (HELP_OPTION_DESCRIPTION, stdout);